Originally Posted by ahmed_indian
Yes, you need to make the hamza sound. So, if you stop, it will be prononunced min shay' (with the apostrophe denoting the hamza sound with a sukoon on it). If stopping, you need to elongate the word shay' for 2, 4 or 6 counts.
If you do not stop, then it is min shay'in NOT min shayin (apostrophe demotes hamza). There is no elongation if you are not stopping.
The hamza is an integral letter of the word shay'un (not shayun without a hamza, there is no such word) meaning, "thing".